Hi Thanks for your explanation and the quick response --- On Fri, 10/7/09, David Ballester <ballester.david@xxxxxxxxx> wrote: From: David Ballester <ballester.david@xxxxxxxxx> Subject: Re: How does a LUN map to a disk or a partition To: "hrishy" <hrishys@xxxxxxxxxxx> Cc: oracle-l@xxxxxxxxxxxxx Date: Friday, 10 July, 2009, 9:53 AM 2009/7/10 hrishy <hrishys@xxxxxxxxxxx> Hi David Thanks for a quik response do you mean to say LUN0 would map to /dev/sdb ? regards Hrishy --- On Fri, 10/7/09, David Ballester <ballester.david@xxxxxxxxx> wrote: From: David Ballester <ballester.david@xxxxxxxxx> Subject: Re: How does a LUN map to a disk or a partition To: hrishys@xxxxxxxxxxx Cc: oracle-l@xxxxxxxxxxxxx Date: Friday, 10 July, 2009, 9:29 AM 2009/7/10 hrishy <hrishys@xxxxxxxxxxx> Hi I would like to know how does a LUN map to a partition from a storage and host point of view ? how do i say /dev/sdb1 maps to LUN0 ? regards Hrishy You can't. LUN0 will be seen as /dev/<whole_disk-aka_LUN> not as a partition of this block device. From storage point of view, several ways exists as several providers ( HP, IBM, EMC... ) develop the storage environment. But, at least from GNU/Linux ( kernel 2.6 & utils ) if the storage driver provider doesn't do it, you can assing the physical partition to a specified device partition path using udev rules ( In fact, if you don't modify nothing, udev will apply standard set of rules ). You can see the actual partition table on the system in /proc/partitions D. I think so